Fix: Optimize dataset page layout and internationalization and default values for multi selection #3221 (#9695)

### What problem does this PR solve?

Fix: Optimize dataset page layout and internationalization and Fix
setting default values for multi selection drop-down boxes #3221

-Adjust the style and layout of each component on the dataset page
-Add and update multilingual translation content

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/pages/dataset/testing/index.tsx

@@ -1,4 +1,5 @@
 import { useTestRetrieval } from '@/hooks/use-knowledge-request';
+import { t } from 'i18next';
 import { useState } from 'react';
 import { TopTitle } from '../dataset-title';
 import TestingForm from './testing-form';
@@ -23,8 +24,8 @@ export default function RetrievalTesting() {
     <div className="p-5">
       <section className="flex justify-between items-center">
         <TopTitle
-          title={'Retrieval testing'}
-          description={`Conduct a retrieval test to check if RAGFlow can recover the intended content for the LLM.`}
+          title={t('knowledgeDetails.retrievalTesting')}
+          description={t('knowledgeDetails.retrievalTestingDescription')}
         ></TopTitle>
         {/* <Button>Save as Preset</Button> */}
       </section>
@@ -33,7 +34,7 @@ export default function RetrievalTesting() {
           <div className="p-4 flex-1">
             <div className="flex justify-between pb-2.5">
               <span className="text-text-primary font-semibold text-2xl">
-                Test setting
+                {t('knowledgeDetails.testSetting')}
               </span>
               {/* <Button variant={'outline'} onClick={addCount}>
                 <Plus /> Add New Test

web/src/pages/dataset/testing/testing-result.tsx

@@ -6,6 +6,7 @@ import { RAGFlowPagination } from '@/components/ui/ragflow-pagination';
 import { useTranslate } from '@/hooks/common-hooks';
 import { useTestRetrieval } from '@/hooks/use-knowledge-request';
 import { ITestingChunk } from '@/interfaces/database/knowledge';
+import { t } from 'i18next';
 import camelCase from 'lodash/camelCase';
 import { useMemo } from 'react';
 
@@ -66,7 +67,7 @@ export function TestingResult({
     <div className="p-4 flex-1">
       <div className="flex justify-between pb-2.5">
         <span className="text-text-primary font-semibold text-2xl">
-          Test results
+          {t('knowledgeDetails.testResults')}
         </span>
         <FilterPopover
           filters={filters}